Question

Which of the following is not a scalar quantity?
1. Power
2. Density
3. Kinetic energy
4. Torque

Answer 1

Correct Answer - Option 4 : Torque

The correct answer is option 4) i.e. Torque

CONCEPT:

• Scalar quantities: The physical quantities which have only magnitude and no direction are called scalar quantities or scalars.
  • Examples: Mass, volume, density, time, temperature, electric current, Luminious intensity, etc.
• Vector quantities: The physical quantities which have both magnitude and direction and obey the laws of vector addition are called vector quantities or vectors.
  • Examples Displacement, velocity, force, momentum, etc.
     

EXPLANATION:

• Power is the rate of energy transfer with respect to time. It is a scalar quantity.
• Density is the amount of mass contained in a given volume of the substance. It is a scalar quantity.
• Kinetic energy is the energy possessed by an object by virtue of its motion. Energy is a scalar quantity.
• Torque is a turning effect due to a force applied on an object and causes rotatory motion. The direction of rotation depends on the direction of the force. Thus, torque is a vector quantity.